Warp-let-off device for narrow-ware looms



July 21, 1925. 1,546,582

E. R. HOLME$ WARP LET-OFF DEVICE FOR NARROW WARE LO0MS giled'A r l 5. 192a Patented July 21, 1925.

'UNITEDV'STATES PATENT OFFICE.

ELBRIIDGE R. HOLMES, OF WORCESTER, MASSACHUSETTS, ASSIGNQR TO CROMPTON & KNOWLES LO'OM WORKS, '01 WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

WARP-LET-OFF nnvron ron minnow-WARE LooMs.

Application filed April 5, 1923. Serial No. 635,168.

To all whom it may concern:

. Be it known that I, Ennnrncn RHonruns, a citizenof the United States, residing at Worcester, in the county of Worcester and .State of Massachusettahave invented a new and useful WarpLet-Off Device forNarrow-lVare Looms, of which the following is a specification.

This inventionrelat-es to an improved letoif and tension device particularly designed for use in narrow ware looms. looms the tension uponeach warp thread is commonly controlled by a weighted pul ley hanging upon a'loop of the warp thread.

" As the pulley is gradually raised, it finally engages a lever which releases a? friction device which normally holds the correspond- 1ng, warp spool or holder from rotation.

lVhen the friction is released, the spool rotates freely and the loop of warp is lengthened untiltheweighted pulley is lowered and the friction is again applied.

It is the object of my invention to provide an improved construction of friction r device by which the rotation of the warp spools or holders may be accurately and cf 7 fectively controlled. 7 In the preferred'form this result is obtained by providing a pair of friction plates, one 011 each side of a friction'di'sc rotatable with the warp spool, together with improved devices for applying or releasingthe friction of the plates at the'si'des' of said disc.

My invention further relates to arrange ments and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which Fig. 1 is a side elevation of the rear por tion of a loom embodying my improvements;

Fig. 2 is an enlarged side elevation of one of the warp spools and its supporting and controlling mechanism, looking in the direction of the arrow 2 in Fig. 3;

Fig. 3 is a sectional bottom View taken along the line 3-3 in Fig. 2;

Fig. 4: is a sectional front elevation taken along the line 4t in Fig. 2;

Fig. 5 is a detail sectional view taken along the line 55 in Fig. 3; and

In such 7 Fig. 6 is a partial side elevation of one of the fr ction plates.

Referring to the drawings, I have shown a portion of a. loom side 10 to which a creel frame 11 is secured. Bars 12 are pivoted at 13 in the upper rear portion of the frame 11 and are detachably connected to the frame by bolts and nuts 14 at their lower ends, the ends of the bars being slotted to permit convenient removal of the bolts.

A plurality of spindles 15 are secured to each bar 12 and the warp spools or other holders S are rotatably supported on the spindles 15. It should be understood that the terin Warp spool as used in this specification includes not only the usual spool having two heads but also any equivalent structure for holding the warp.

The warp threads pass from the spools S around guide pulleys 16 at the upper rear part of the frame 11 and then over a series of guide pulleys 17. Each warp thread makes a loop between a pair of pulleys 17, and each loop passes around a movable weighted pulley 19 supported thereby. The weight upon the pulley may be varied by placing detachable weights on the hook weight 20. Each weight 20 is connected to its pulley 19 by an open link 21 through which extends a lever 22.

Each lever 22 is secured to a head or cap 23 (Fig. 3) which may be adjustably clamped by a bolt 24 (Fig. 2) to a sleeve or'cylinder 25 rotatablymounted on a stud I 26. The stud 26 and a corresponding stud 27 are lined in a crossplate 28 secured to one of the upright bars 12. A. pair of friction plates 30 are provided with openings 31 at one end fitting the sleeve 25 and with horizontal slots 32 at the other end fitting the stud 27. A screw 30 extends through the plates 30 adjacent the stud 27 and prevents relative angular displacement of the plates. The sleeve 25 is provided with a pair of reversely disposed spiral grooves and the plates 30 have lugs 34 (Fig. 6) extending into the openings 31 and fitting the grooves 33.

Pads 35 of leather or other friction material are secured to the inner sides of the plates 30 and engage the upper portion of a disc 36 rotatably mounted on the spool spindle 15. A headed stud 37 is secured in each disc 36 and extends through an opening 38 in the head of the spool S. When the stud is in retarding position, the head of the stud is out of alignment with the opening 38 and thus prevents axial separation of the spool and disc.

The disc 86 may be permitted to slide axially a limited distance on the spindle l and the plates 30 and threaded sleeve are also freely slidable on the studs 26 and 27, so that the difference in direction of pull of the warp thread IV, as it is unwound from different parts of the spool, may not vary the drag or tension onthe disc 36. The free sliding movement permits the pates to center or adjust them selves with the disc 36 in every position thereof and is limited by the flange or collar 39 on the spindle 15.

Having described the construction of my improved let-off and tension device, the operation thereof is as follows: I

Each lever 22 and head 23 are ad-lusted on asleeve 25 by a clamping bolt 24 in such an angular position that the Weight of the lever will turn the threaded sleeve 25., drawing the plates 30 together, and apply; ing the desired friction when the lever is in approximately horizontal position. Then the lever is raised by engagement thereof by the link 21, the plates 3.0 are separated, leaving the disc 36 and spool S free to roe tate until the pulley 19 and link 21 descend tly f ee the lever an pe m t the weight thereof to again apply friction to the disc, The device is thus entirely auto.-v matic and maintains the desired even ten= sion on the warp at all times.

Having thus described my invention and the advantages thereof, I dov not wish to be limited to the details herein disclosed other: wise than as set forth in the claims but what I do claim is 1. In a narrow ware loom, a warp spool, a spool-controlling disc rotatable therewith, a pair of frictionplates engaging opposite sides of said disc, means to hold said plates from relative angular movement, and warp controlled means effective to cause said plates to move simultaneously toward or away from said disc and to thereby control the rotation of said spool.

2. In a narrow ware loom, a. support for a warp spool, a spool-controlling disc ro tatably mounted thereon and detachably connected to said spool, a pair of friction members mounted on opposite sides of said disc, means to hold said plates from relative angular movement, and a warpcontrolled device connected to move said members simultaneously toward and from said disc.

3. In a narrow ware loom, a support for a warp spool, a spool-controlled disc rotatably mounted thereon, a pair of friction members mounted on opposite sides of said disc, a. sleeve having reversed spiral grooves therein with which said friction members respectively engage, and a warpcontrolled device for moving said sleeve angularly and thereby causing said members to inove "simultaneously toward or from said disc.

4. In a narrow ware 1 0, 10, a support for a warp spool, 21, spool controlling disc rotatably mounted thereon, a pair of friction members mounted on opposite sides of said disc means to hold said plates from relative angular movement, and a warprcontrolled device connected to move said members simultaneously toward and from said disc, said members and said device being mounted for free movement with the warp spool xially thereof.

5., In a narrow ware loom, a support for a war}? spool, a sped-con rolling disc r0- tatably mounted on said support, a pair of ict on plates engaging opposi sides of said disc, slee e hav ng re rse p a groo es the ei engag y said pla es, s uds on. which said plates and ve r xia ly slidab e, arp-controlled m a or a gu arly movi g aid e e to pp y release friction on said disc.

.In. te t mony wh reof I have hereunto fiixed my igna ur LBBIDGE R- H LM 

